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440 B.C. First atomic theory The notion that all matter consists of fundamental particles called atoms was first put forward by Greek philosophers Leucippus and his disciple Democritus, in 5th century BC. They believed that all matter consisted of tiny particles that could no longer be broken down. 'Atom' in Greek means indivisible.However, the other Greek philosophers did not subscribe to these beliefs; instead, they thought that matter was made up of four elements, air, water, fire and earth.
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 Democritus was responsible for further developing the atomic theory formed by Leucippus.
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